Isothermal body: what is it, types, advantages and how to choose

Term "isothermal body" often found in the trucking industry, but not everyone understands what it means in practice. In short, this is a specialized type of body that maintains a stable temperature inside, protecting the cargo from external climatic conditions. Such bodies are used to transport food, medicines, chemicals and other goods sensitive to temperature changes.

However, not all insulated bodies are created equal. They are divided into several types depending on the principle of operation: from simple thermoses (passive isolation) to full refrigerators (active cooling). The choice depends on the type of cargo, transportation distance and budget. For example, to transport ice cream 500 km you will need a refrigerator with a refrigeration unit, but to deliver confectionery products 100 km a thermos may be enough.

In this article, we will look at how isothermal bodies are designed, what types there are, where they are used, and what to look for when buying or renting. We will also answer frequently asked questions: is it possible to convert a regular van into an isothermal one, what documents are needed for legal operation, and how to save on maintenance.

What is an isothermal body and how does it work?

An isothermal body is a sealed structure with a heat-insulating layer that minimizes heat exchange between the internal space and the external environment. The main task of such a body is maintain the specified temperature of the cargo for a certain time, regardless of the weather outside.

Structurally, the body consists of three main layers:

• 🔹 External skin - usually made of aluminum, fiberglass or galvanized steel. Protects against mechanical damage and precipitation.
• 🔹 Thermal insulation material - polyurethane foam, polystyrene foam or mineral wool. The layer thickness varies from 40 to 100 mm depending on the body class.
• 🔹 Internal lining — food grade stainless steel, aluminum or fiberglass. Must be hygienic and moisture resistant.

It is important to understand that the body itself is isothermal does not cool or heat cargo - it's only slows down temperature change. To actively maintain the climate, additional equipment is required: refrigeration units (chillers), heaters or ventilation systems.

Body efficiency is measured by the heat transfer coefficient (K). The lower it is, the better the insulation. For example, for transporting frozen products (-18°C) the coefficient should not be higher 0.4 W/m²K, and for chilled (+2…+8°C) - up to 0.7 W/m²K.

Types of isothermal bodies: which one is suitable for your tasks

All isothermal bodies are divided into three main types, differing in operating principle and purpose. The choice depends on what kind of cargo you are transporting and over what distance.

1. Thermos (passive insulation)

The simplest and most budget option. The body is a “thermos” without active cooling. Suitable for:

• 🍎 Transportation of chilled products (+2…+8°C) for short distances (up to 200 km).
• 🥖 Bakery and confectionery products.
• 💊 Medicines that do not require strict temperature conditions.

Advantages: low cost, ease of maintenance, lack of dependence on electronics. The disadvantage is the limited temperature retention time (usually up to 12 hours).

2. Refrigerator (active cooling)

Equipped with a refrigeration unit (chiller), which maintains the set temperature in the range from -25°C up to +25°C. Used for:

• ❄️ Ice cream, meat, fish (-18…-20°C).
• 🥩 Chilled semi-finished products (0…+4°C).
• 🧪 Laboratory reagents and vaccines.

There are refrigerators autonomous (with own diesel generator) and dependent (powered from the car's electrical network). The former are more expensive, but suitable for long-distance flights.

3. Heated body

A less common option, designed for transporting goods that cannot be frozen, but need to be protected from the cold. Examples:

• 🍌 Bananas, citrus fruits (temperature higher +12°C).
• 🧴 Cosmetics and perfumes.
• 🔋 Batteries and electronics.

Equipped with heating systems (electric or diesel). Often combined with cooling for versatility.

Body type	Temperature	Transportation distance	Cost (from)
Thermos	+2…+8°C (passive saving)	Up to 200 km	From 800,000 ₽
Refrigerator	-25…+25°C (active cooling)	Any (depending on fuel)	From 1,500,000 ₽
Heated body	+10…+25°C	Up to 500 km	From 1,200,000 ₽
Universal (cooling + heating)	-20…+20°C	Any	From 2,000,000 ₽

Where isothermal bodies are used: top 5 areas

Isothermal bodies are in demand in a variety of industries. Here five key areas, where you can’t do without them:

1. Food industry

The most obvious area. Bodies are used for transportation:

• 🥩 Meat and poultry (temperature 0…+4°C).
• 🐟 Fish and seafood (-2…+2°C).
• 🍦 Ice cream (-18°C).
• 🥛 Dairy products (+2…+6°C).

According to Rospotrebnadzor statistics, 30% of food spoilage during transportation occurs due to temperature violations. Therefore, for suppliers of supermarkets and restaurants, isothermal transport is a mandatory condition for cooperation.

2. Pharmaceuticals and medicine

Medicines, vaccines and biomaterials require strict temperature control. For example:

• 💉 Vaccines (usually +2…+8°C, but there are also frozen ones -70°C).
• 🩸 Donor blood (+4°C).
• 🧬 Laboratory reagents.

For such cargoes, refrigerators with double temperature control and a warning system for deviations.

3. Chemical industry

Some chemicals lose their properties when overheated or frozen. For example:

• 🧴 Cosmetics (creams, shampoos - temperature is higher +10°C).
• 🔋 Electrolytes for batteries.
• 🧪 Paints and varnishes.

4. Floriculture and agriculture

Freshly cut flowers, seedlings and some fruits (bananas, mangoes) are transported at +12…+15°C. For this purpose, heated bodies or universal refrigerators are used.

5. Electronics and technology

Lithium-ion batteries, LCD panels and other sensitive equipment require protection from condensation and sudden temperature changes. For example, when transporting server equipment, they support +18…+24°C.

How to choose an isothermal body: 7 key criteria

When buying or renting an insulated body, it’s easy to make a mistake and overpay for unnecessary options. To avoid this, pay attention to seven parameters:

1. Isothermal body class (according to ATP)

European standard ATP divides bodies into classes depending on the heat transfer coefficient (K):

• Class A (K ≤ 0,4) - for frozen cargo (-20°C).
• Class B (K ≤ 0,5) - for chilled (0…+4°C).
• Class C (K ≤ 0,7) - for cargo with temperature +2…+8°C.
• Class F - heated bodies.

Only suitable for transporting ice cream class A, and for vegetables - class C.

2. Type of refrigeration unit

If you need a refrigerator, choose between:

• 🔋 Autonomous - with a diesel generator. Suitable for long-distance flights, but require refueling.
• ⚡ Electrical — powered from the car's network. Cheaper to operate, but limited by battery capacity.
• ❄️ Cryogenic - use liquid nitrogen. Very effective, but expensive to maintain.

3. Volume and load capacity

Standard dimensions:

• 🚐 Car vans: 8–12 m³ (for example, GAZelle Next or Ford Transit).
• 🚛 Medium-tonnage: 20–30 m³ (Mercedes Sprinter, Iveco Daly).
• 🚚 Tractors with semi-trailers: 80–100 m³ (Scania R450, Volvo FH).

4. Body material

Durability and weight depend on the material:

• 🔳 Sandwich panels (polyurethane foam between aluminum) - light and durable.
• 🧊 Three-layer fiberglass - resistant to corrosion, but more expensive.
• 🔩 Galvanized steel - cheaper, but heavier and prone to rust.

5. Additional options

Useful features that will simplify your work:

• 📊 Telemetry — remote temperature control via GPS.
• 🔒 Sealed doors with rubber seals.
• 🧊 Defrost system (for refrigerators).
• 🔋 Backup battery in case the main one breaks down.

6. Certification

Check availability:

• 📄 ATP (for international transport).
• 🏥 GDP (for medical cargo).
• 🍗 HACCP (for food products).

7. Brand and service support

Popular body manufacturers:

• 🇩🇪 Schmitz Cargobull (Germany) - premium segment, reliability.
• 🇫🇷 Lamberet (France) - specialization in refrigerators.
• 🇷🇺 Tonar (Russia) - optimal price/quality ratio.
• 🇮🇹 Carrozzeria Frigo (Italy) - bodies for vans.

Is it possible to make an isothermal body with your own hands?

Theoretically yes, but in practice it is risky and unprofitable decision. Let's consider the pros and cons of self-conversion.

Pros:

• 💰 Savings on purchasing a new body (the difference can reach 50%).
• 🔧 Ability to adapt the body to specific needs.

Cons:

• ⚠️ Lack of certification — without ATP and GDP you will not be allowed to transport food and medical cargo.
• 🔥 Fire danger - Improper insulation can lead to fire.
• ❄️ Low efficiency — homemade thermal insulation rarely maintains the temperature for more than 4–6 hours.
• 📜 Problems with the traffic police — re-equipment requires changes to the PTS.

If you still decide, here minimum set of works:

1. Dismantling the old casing and cleaning the frame from rust.
2. Laying thermal insulation (polyurethane foam or basalt wool with a thickness of at least 50 mm).
3. Installation of internal lining made of food-grade aluminum or stainless steel.
4. Sealing seams and installing door seals.
5. Check with a thermal imager (required!).

Cost of materials for van GAZelle Next (10 m³) will be approx. 250 000–350 000 ₽. But without certification, you will only be able to transport non-food cargo (for example, flowers or electronics).

What happens if you transport products in an uncertified body?

When checked by Rospotrebnadzor or the veterinary service, you will be fined up to 500,000 rubles (for legal entities) or the cargo will be confiscated. In addition, the insurance company may refuse to pay if the product is damaged.

Maintenance and repair: how to extend the life of the body

An isothermal body is not a “set it and forget it” thing. It requires regular maintenance, otherwise the thermal insulation will lose its properties and the refrigeration equipment will fail. Here key care rules:

1. Cleaning and disinfection

After each transportation of food cargo:

• 🧽 Wash interior surfaces hot water (60–70°C) with detergent.
• 🦠 Disinfect with chlorhexidine solution or special compounds (for example, "Dezoform").
• 🌬️ Dry the body with the doors open for at least 2 hours.

⚠️ Attention: Never use abrasives or metal brushes to wash the body - they damage the insulating layer and inner lining. This leads to the formation of “cold bridges” and a loss of efficiency by 20–30%.

2. Leak test

Once a month, inspect:

• 🚪 Door seals - they must be elastic, without cracks.
• 🔍 Seams and panel joints - if you find any cracks, use sealant "Soudal" or "Tytan".
• 📉 The pressure in the body - with the doors closed, it should drop no faster than 5 mbar/hour.

3. Refrigeration unit maintenance

For refrigerators:

• ⛽ Change the oil in the compressor every 1,500 operating hours.
• ❄️ Clean the evaporator from frost at least 1 time every 3 months.
• 🔋 Check the refrigerant (freon) level once a year.

⚠️ Attention: If the refrigeration unit begins to “hum” louder than usual or does not maintain temperature well, do not delay diagnostics. A compressor failure will cost 150 000–300 000 ₽, and regular maintenance costs 5–10 times less.

4. Storage during the off-season

If the body is idle in winter:

• 🏠 Store in a dry, closed area (garage, hangar).
• 🔌 Turn off the refrigeration unit and drain the fuel (for diesel models).
• 🚫 Do not leave doors closed for a long time - this leads to mold.

Type of work	Frequency	Cost (₽)
Washing and disinfection	After every flight	1 500–3 000
Leak test	Once a month	Free (do it yourself)
Maintenance of refrigeration unit	Every 500 operating hours	15 000–40 000
Freon replacement	Once every 1–2 years	10 000–25 000

How much does an isothermal body cost: prices in 2026

The cost depends on the body type, brand and configuration. Below are the current prices for new and used models (according to "Autostat" and "Drom" for June 2026).

New bodies (installation on chassis)

| Body type | Volume (m³) | Price (from) |

|--------------------------|------------|-----------|

| Thermos (Class C) | 8–12 | 800,000 ₽ |

| Refrigerator (Class A) | 20–30 | 1,800,000 ₽|

| Universal (cooling + heating) | 15–25 | 2,200,000 ₽|

| Body for tractor (semi-trailer) | 80–100 | 4,500,000 ₽|

Used body (in good condition)

| Model make | Year of release | Price (from) |

|--------------------------|-------------|-----------|

| GAZelle Next (thermos) | 2020–2022 | 600,000 ₽ |

| Mercedes Sprinter (refrigerator) | 2018–2021 | 1,500,000 ₽|

| Scania R420 with semi-trailer | 2015–2019 | 3,800,000 ₽|

The average payback of an isothermal body is 2–3 years during intensive use (for example, daily trips for supermarkets). For rare transportation, it is more profitable to rent: the cost of renting a refrigerated van is from 3,500 ₽/day, semi-trailer - from 8,000 ₽/day.

⚠️ Attention: When purchasing a used body, be sure to check:

• 📄 Availability of an ATP certificate (must be valid).
• 🔧 Condition of the refrigeration unit (check compression and freon level).
• 🚗 Operation history (if the body worked in a meat processing plant, there is a high probability of corrosion).

FAQ: Frequently asked questions about isothermal bodies

🔹 Do you need a special license to transport products in an isothermal body?

A separate license is not required to transport food products, but the following is required:

• ATP certificate for the body.
• Sanitary passport for the vehicle (issued at Rospotrebnadzor).
• Contract for disinfection (if you are transporting meat, dairy or fish).

For medical cargo, a license for pharmaceutical activities is additionally required.

🔹 Is it possible to transport frozen and chilled products in one body?

Technically possible, but not recommended. The temperature difference will lead to:

• Condensation and icing.
• Spoilage of refrigerated products (if they are located near the freezing area).

It is better to use bodies with separate compartments or do flights separately.

🔹 Which body should I choose for transporting flowers?

Suitable for flowers:

• Heated body (temperature +12…+15°C).
• Universal refrigerator with "+10°C" mode.

Important: flowers are afraid of drafts, so the body must have adjustable ventilation.

🔹 How long does a thermos body keep its temperature without a refrigerator?

Time depends on:

• Insulation thickness (50 mm - 4–6 hours, 100 mm - up to 12 hours).
• Outside temperature (in summer the time is reduced by 30%).
• Door opening frequencies.

To increase the time use cold accumulators (gel or dry ice).

🔹 Is it possible to insulate a regular van with polystyrene foam and use it as an isothermal one?

Technically yes, but:

• Polystyrene foam has low strength and can crumble.
• Without ATP certification you will not be allowed to fly commercially.
• The service life of such insulation is 1–2 years (versus 10+ years for factory bodies).

For personal needs (for example, transporting fish from winter fishing) - an option. For business - no.